The problem with Ele + Shadow is that both of those need someone capable of peeling well for them (Fmage's being the best at that, hence god-comp with an ele - which will likely be better than god comp after ele buffs in 5.2). Feral has enough support and survivability and pressure right now to also make the comp effective, and that lets you get an hpal or mistweaver for repentance/paralysis.